Distribution of microbial populations and their relationship with environmental variables in the North Yellow Sea, China |
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Authors: | Xiaoge Bai Min Wang Yantao Liang Zhifeng Zhang Fang Wang Xuejiao Jiang |
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Institution: | 1. College of Marine Life Sciences, Key Laboratory of Marine Genetics and Breeding, Ministry of Education, Ocean University of China, Qingdao, 266003, P. R. China
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Abstract: | In order to understand the large-scale spatial distribution characteristics of picoplankton, nanophytoplankton and virioplankton
and their relationship with environmental variables in coastal and offshore waters, flow cytometry (FCM) was used to analyze
microbial abundance of samples collected in summer from four depths at 36 stations in the North Yellow Sea (NYS). The data
revealed spatial heterogeneity in microbial populations in the offshore and near-shore waters of the NYS during the summer.
For the surface layer, picoeukaryotes were abundant in the near-shore waters, Synechococcus was abundant in the offshore areas, and bacterial and viral abundances were high in the near-shore waters around the Liaodong
peninsula. In the near-shore waters, no significant vertical variation of picophytoplankton (0.2–2μm) abundance was found.
However, the nanophytoplankton abundance was higher in the upper layers (from the surface to 10 m depth) than in the bottom
layer. For the offshore waters, both pico- and nanophytoplankton (2–20μm) abundance decreased sharply with depth in the North
Yellow Sea Cold Water Mass (NYSCWM). But, for the vertical distribution of virus and bacteria abundance, no significant variation
was observed in both near-shore and offshore waters. Autotrophic microbes were more sensitive to environmental change than
heterotrophic microbes and viruses. Viruses showed a positive correlation with bacterial abundance, suggesting that the bacteriophage
might be prominent for virioplankton (about 0.45μm) in summer in the NYS and that viral abundance might play an important
role in microbial loop functions. |
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Keywords: | picoplankton nanophytoplankton bacterioplankton virioplankton the North Yellow Sea(NYS) |
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